■Outline
Apple Inc in U.S dealt with several security issues with "iOS 8.4", the latest version of iOS.

■Candidate
- iPad later than 2
- iPhone later than 4s
- iPod touch later than (The fifth generation)

■Measures
This issue will be solved by updating it to the latest version provided by developer or your OS vendor.

■References
Apple Inc.
About the security content of iOS 8.4

ITmedia
The latest version of iOS, OS X, Safari was released, which covers the security issues.